Add more acks

Author: kpeeters

frontend/gtkmm/NotebookWindow.cc

@@ -1663,6 +1663,7 @@ void NotebookWindow::on_help_about()
 	std::vector<Glib::ustring> special;
 	special.push_back("José M. Martín-García (for the xPerm canonicalisation code)");
 	special.push_back("Dominic Price (for the conversion to pybind and most of the Windows port)");
+	special.push_back("Connor Behan (for various improvements related to index-free algorithms)");	
 	special.push_back("James Allen (for writing much of the factoring code)");
 	special.push_back("Software Sustainability Institute");
 	special.push_back("Institute of Advanced Study (for a Christopherson/Knott fellowship)");